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                魏总刷DP                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：256MB</p>			</div>
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                                <h3>题目描述</h3><p><div>魏总，也就是DP魏又开始刷DP了。一共有n道题，第i道题魏总原本需要u[i]秒的时间。不过，为了表达对这些水题的藐视，魏总决定先睡k秒再开始刷题。魏总并不清楚自己会睡多久，只知道k是不超过m的正实数。并且魏总还忘了这节课有多长，只记得这节课的长度T（单位：秒）是在L到R之间。（魏总是从开始上课的时候开始睡的）睡醒后，魏总神奇地发现自己做每道题所需的时间变成了原来的k倍。不过DP魏就是DP魏，他可以同时做这n道DP，互不影响。</div>
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<div>魏总本想虐场，但他很快发现自己低估这些题了。于是他决定将题分为HARD和EASY。对于每道HARD的题，他希望能最晚在下课后late[i]秒内完成，而对于EASY的题，他希望在下课前rest[i]秒之前完成。</div>
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<div>求魏总达到目标的概率。</div>
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<p class="MsoNormal" align="center" style="text-align:center"></p></p><hr/><h3>输入格式</h3><p><div>第一行，一个整数n</div>
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<div>第二行，三个实数m，L，R</div>
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<div>第三行，n个整数，第i个为u[i]</div>
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<div>就下来n行，每行一个字符串和一个整数，字符串为&rdquo;HARD&rdquo;或&rdquo;EASY&rdquo;，整数为对应的late[i]或rest[i]。</div>
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<p></p></p><hr/><h3>输出格式</h3><p><div>一行，魏总达到目标的概率，保留4位小数。</div>
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<p></p></p><hr/><h3>样例输入</h3><pre>2
1.50 0.630 1.810
2 2 
EASY 1
EASY 0
</pre><hr/><h3>样例输出</h3><pre>0.0618</pre><hr/><h3>提示</h3><p><div>对于100%的数据，0&lt;n&lt;=100000,0&lt;m&lt;100000,0&lt;L&lt;R&lt;100000,0&lt;late[i],rest[i]&lt;=100000。</div>
<p></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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